Recommendations from others are noted in (parentheses). The rest are my personal recommendations.
- The Pragmatic Programmer - Hunt & Thomas
 - Design Patterns - Gamma et al.
 - Domain-Driven Design - Evans
 - Implementing Domain-Driven Design - Vernon (via @mbthegreat)
 - Coders at Work - Seibel
 - Elements of Programming Style - Kernighan & Plauger
 - Enterprise Design Patterns - Fowler
 - Refactoring - Fowler
 - Structure and Interpretation of Computer Programs - Abelson, Sussman & Sussman
 - The C Programming Language - Kernighan (Good for Non-C programmers, too!)
 - Code Complete - McConnell
 
- The Mythical Man Month - Brooks
 - Please Understand Me - Keirsey
 - Getting Real - Fried
 - You're My Favorite Client - Monteiro (via @jasonsee)
 - The One Minute Manager - Blanchard & Johnson (via Sara)
 - The Lean Startup - Ries (via @leilis and @benbalter)
 - Here Comes Everybody: The Power of Organizing Without Organizations - Shirky (via @benbalter)
 - Being Geek: The Software Developer's Career Handbook - Lopp (via @benbalter)
 - The Innovator's Dilemma - Christensen (via @benbalter and @edgesmash)
 - Producing Open Source Software - Fogel (via @benbalter)
 - Peopleware: Productive Projects and Teams - DeMarco (via @benbalter and @edgesmash)
 - The Wealth of Networks: How Social Production Transforms Markets and Freedom - Benkler (via @benbalter)
 - The Cathedral & the Bazaar: Musings on Linux and Open Source by an Accidental Revolutionary - Raymond (via @benbalter)
 - The Master Switch: The Rise and Fall of Information Empires - Wu (via @konklone and @benbalter)
 - Hackers: Heroes of the Computer Revolution - Levy (via @benbalter)
 
- The Design of Everyday Things - Norman
 - Don't Make Me Think - Krug
 - The Visual Display of Quantitative Information - Tufte
 - Grid Systems in Graphic Design - Muller-Brockmann
 - Semiology of Graphics: Diagrams, Networks, Maps - Bertin (via @tmcw)
 
- Made to Stick - Heath (via @benbalter)
 - Users, Not Customers - Shapiro (via @benbalter)
 - The Long Tail - Anderson (via @benbalter)
 - Principles of Marketing - Kotler & Armstrong (via @eshinn)
 - Content Strategy at Work: Real-world Stories to Strengthen Every Interactive Project - Bloomstein (via @eshinn)
 
- The Elements of Style - Strunk & White
 - Zen Mind, Beginner's Mind - Suzuki
 - Clock Of The Long Now (via @timmcdaniels)
 - Mindfulness in Plain English - Gunaratana (via Jerrica)
 - Neuromancer - Gibson